#ifndef __UDP_SERVER_HPP__
#define __UDP_SERVER_HPP__

#include <iostream>
#include <string>
#include <memory>
#include <cstring>
#include <errno.h>
#include <strings.h>

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include "Common.hpp"
#include "Log.hpp"


using namespace LogModule;



const static int gsockfd = -1;
const static std::string gdefaultip = "127.0.0.1";//表示本地主机
const static uint16_t gdefaultport = 8080;

class UdpServer
{
public:
    UdpServer(const std::string & ip = gdefaultip,uint16_t port = gdefaultport)
    :_sockfd(gsockfd),
     _ip(ip),
     _port(port),
     _isrunning(false)
    {
    }
    void InitServer()
    {
        // 1.创建套接字
        _sockfd = ::socket(AF_INET, SOCK_DGRAM, 0);
        if (_sockfd < 0)
        {
            LOG(LogLevel::FATAL) << "socket: " << strerror(errno);
            Die(SOCKET_ERR);
        }
        LOG(LogLevel::INFO) << "socket success, sockfd is : " << _sockfd;

        // 2.填充网络信息,再进行bind
        struct sockaddr_in local;
        bzero(&local,sizeof(local));
        local.sin_family = AF_INET;
        local.sin_port = ::htons(_port); //要被发送给对方的,即要发送到网络中
        local.sin_addr.s_addr = ::inet_addr(_ip.c_str());//1.string ip -> 4bytes  2.newwork order

        // 2.1 bind :: 设置进入内核中
        int n = ::bind(_sockfd,CONV(&local),sizeof(local));
        if(n < 0)
        {
            LOG(LogLevel::FATAL) << "bind: " << strerror(errno);
            Die(BIND_ERR);
        }
        LOG(LogLevel::INFO) << "bind success";
    }
    void Start()
    {
        _isrunning = true;
        while(true)
        {
            char inbuffer[1024];
            struct sockaddr_in peer;
            socklen_t len = sizeof(peer);
            ssize_t n = ::recvfrom(_sockfd,inbuffer,sizeof(inbuffer)-1,0,CONV(&peer),&len);
            if(n > 0)
            {
                //1.消息内容 && 2.谁给我发的
                uint16_t clientport = ::ntohs(peer.sin_port);
                std::string clientip = ::inet_ntoa(peer.sin_addr);
                inbuffer[n] = 0;
                std::string clientinfo = clientip + " : " + std::to_string(clientport) + " # " + inbuffer;
                
                LOG(LogLevel::DEBUG) << clientinfo;
                
                std::string echo_string = "echo# ";
                echo_string += inbuffer;
                ::sendto(_sockfd,echo_string.c_str(),echo_string.size(),0,CONV(&peer),sizeof(peer));
            }
        }
    }
    ~UdpServer()
    {
    }

private:
    int _sockfd;
    uint16_t _port;  //服务器的端口
    std::string _ip; //服务器的IP
    bool _isrunning; //服务器运行状态
};

#endif